I removed an old sedis chain from an old Peugeot UO8, after thorough cleaning, I notice plenty of cracks, need a replacement chain, I am kind of a layman as far as sizing goes, went to fleabay etc not sure on the sizing, what do I need? the chain is 4 feet 5 inches long , came off a 10 speed French bike, what am I looking for as far as sizing ? or what kind of chain would fit? thanks